code: def base64_encode_image(img):
      # base64 encode the input NumPy array
      return base64.b64encode(img).decode("utf-8")
  
file_path: BigDL/python/serving/src/bigdl/serving/kafka/client.py
imports: from kafka import KafkaProducer, KafkaConsumer
  from kafka.errors import kafka_errors
  import json
  from bigdl.serving.schema import *
  from bigdl.serving.log4Error import invalidInputError
label_desc: Use image node_id 5 for calling the InputQueue obj's underlying member method code with example usage: obj.base64_encode_image(img) and returns: base64